1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d29d9d5c2d5d2574a2fc7c2391d5fab6cf4abcaaa5f2d00ebfeaac40982ece3. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1305e2f0-7edd-476a-a106-aaad04e58eaf.json and https://artists.proofprofile.net/proofs/artist/1305e2f0-7edd-476a-a106-aaad04e58eaf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6883f68f51b5003dab4bb04dacc5ef3d88d04211e3ab08def2c1e64e12e314de. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZ900601550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9428b0ad07dc895d9f07e9d5729f42b136103c5616daca54eeb9e1c5a146e23. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZ900601556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cfb6e98542b05edb2f8df2084697ca84c59673340f99e03474616d18c64f64a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZ900601565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab2eb898e1ab632f325c283e54f2d8331901f41eeac3e55c4bb0a5746c1a6eb. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZ900701303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb1dcdaf07e3bcf9105702e86a4bb3d49ffcdb62fd735e66d66208c11202c97. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZ900701304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6bcca474209178ba7f65942a04288ec124b35f5274c51c24f2ebf130a4c265. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZ900701308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9e62556c2016292971aafdf7fee6c44b0fc9257c53bf985ce8167f0c45c891. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZ900900725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128fabf86cc8fc65921561b1dc000d94dac06cd9e1ff6aeafe8fcfff23ce187b. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZ900900729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ba34e42a712c5cabd781087c119c1c1ce66c57093a3d7f7f0b0362ddcec260. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZ900900737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2981b3a6b4e8cac709d144003cccc68a7b3d59f088aa6c96551497f2ebdaa4. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZ900901038.
Junge Männer, Kämpfer, Untergrund Soldaten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503c76e6ad54b496c4a3ea7d6b9dbd967e57028c3be751a3e2fdc6c0f71dd66b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZ900901039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a09ce4be95e4e425825633dff01e05254ef50840e95ec4bafbeffb6168e2f3. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEZ900901047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5094653adaaad88ea4a612481d71ad16f5fd4c3146530a3cf7aab9598045851f. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEBL61300718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61dd088bf0ee44f3191ca9fa4026ea27ede29c27c96927a4b76689c48d651d7a. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEBL60658398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1323a847d80ce0b858ece49942d80a99f47b945acfe9e21119829d72a142f920. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELJ81876074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3989e4474e7040312b1f800e433195fa6f420eabd505fe6fcfd6216585f844c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEVY82000859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb6399c214ccb2a3ea884e577dac83097362ace7fdefafd4051c4a082e4ca97. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEBL60981028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99583cca5c9a583c28e0f9430a5e5035a34b61b38865dffaffb0d59eb1ecd028. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX871579834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f8734ead304f00d200f668f82d294ab526bf39de3aeb2e2068d81caf00077f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1769361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcfb45362dcc42482a37aa2651d8128f81bb4091dd539d45880e49140f49fe1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1769362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea56a9ec7ed49f4ef2045163e95d6aadc7dc9b2887c4fbf0e41d8e19fec43e58. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEBL60773391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d6784c2c0c43ebc1269210252df7172acb5689ad3e1285db0950cf68cf9db8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEBL60773392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148a2506225c6f125b9cb03a9d72fcadd096211b20b7551401b70cd89477662f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEBL60773394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee41a628b07921313b57174636eb71481cf0ad643851d0cba88804e06e64e40a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEBL60773397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa937997995653b6f34ec4e38b9dee72b1c680caeefd3775ce47831d144404e87. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEBL60773401.